Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18dcf4424868988107ae7c833b931f093000a5694ada3feaa128d4ca4cb88931' 
  AND token = 'dAPfJyzpnaFLInf8vlDTK5BgLFv3GySCQZ7vHLVFI7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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