Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd0629926ea1e2d275fbe28ee066d2b32c31e1134a5ebe28fdd02db2cea8178' 
  AND token = 'cwhm3GOFcETs55AKec/K2J0pb1VUldUI3VvU7hjfx48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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