Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f3893ca5bfadc5cb0cb82c4eec453a5b1889e35e2a47ee24132f9409a2a41a' 
  AND token = 'ix5T7SsS9oIXoZNfnAHgReCu6Y45Vl9jVe5yDtXZDh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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