Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9fa9301133b74234e1870147586fe38029cbe766179de8dd2b5093ad9540ac' 
  AND token = 'qDKIbo+PCuFyGbwOpSkEiYAyX2IXPHPII68drTGSgyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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