Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f770944d3140d84e7c36abfff08ab4103f3ef6f02604d5ddf13fe49ffb7d51' 
  AND token = 'LyAu3sOI5gf1MuOg7GRfJmLTDz3jc0WZi2EHyFQio2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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