SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a889257df40b093b3536bf8b754d18ccc9db2e1dfdcee163f6c6a25d58df62' 
  AND token = '9q6MspjQGgMtyCJumdSizwYNW/Mng3Bp2qgQZMEg4QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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