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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8ca4fc11eaf2392e82d24c916d7fb2bf7aea7574a716e100c377d7abfd63c4' 
  AND token = 'hGo/x1f1vEgDPVkR7qtQ8Qwzg6rc4xNOvCLiBBcGvmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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