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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0095c06d186083eb81fea6a6d289cea9a0c3fafa4bda3b6e727ee57f33c04fa' 
  AND token = 'x3US/V/o7uVaHwZFABRAktkv+HsNvAZpcNtMIxGc+nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}