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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd49773b1c1c4cb1742b76fb92cd0fd1eca1859b1f36db13df252c4cbf4d784ae' 
  AND token = '6QQlj9/k8cx1qMopcO78AikJS7nwPQPyfHH7Wh907iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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