Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1e293b9406801796108df505f31368d266253e1c4ce032d785b2157a15524d6' 
  AND token = 'j0J/XMHeDLYQI2CDEkOllvc3flkscwsYjlKc54tddro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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