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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9910a6367655b8b9c15a0f65c08035f6ee2f5ba58032273360267dba2edd8ce' 
  AND token = '4lY0DO5BC9M6W2whRpCl2xshir+QisZJ7Bv738xqzZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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