Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c607e9ad5562d484eab8c1372caa00f8a8aac6ca3f7335cd2e772a38c1a2b9c9' 
  AND token = 'fx1Zi2fhY6Kj396vZ3XPKlWq6zokTHs6hxiYhBEocDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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