SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e712de5a59e8a198f326d6a37415df7d4b0260d956b6bdd46cdf3bb34d7386' 
  AND token = 'V1J6mguZlhz1j/08tDEQycHGAncL2kaKlryBlM8zXZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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