Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3dbd4fa6ed807106638c34b55760c7ceb2e5857b94de48597a25d19f50b4ad0' 
  AND token = 'R1DGiv+DVaTasKwG999yj1Jhl1lBpRGuEaE8vyzvlyA=' 
  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"
    }
  }
}