Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ed3031f8ff638987c2f06c2438c8cfdedd02349a7c8a1fff80df5b3497ebd17' 
  AND token = '3FfN1K1iW7oB8ajkVCH2ojfXzInR0kyuWD9xtD51Ze0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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