Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba9036243ef8ada8865a906f333abe5ea624f9a13ebd6c1a74c909e8a5e7f1c' 
  AND token = 'uwMIqZy29Cn3ErpZxz40ZL583PHzWCgT3gw3E4QekmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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