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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27812b638515a6f74ff6f7b14ccf612379b61280771291c84c743adf7746f118' 
  AND token = 'C4FchCUECO2l6oax87+qWIWLkVPR1Jv2K2EJ7BQncns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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