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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550f57a6068ea91df8e40874690b90f8c10a0dc8aa596c4348ed5766a8e1d821' 
  AND token = 'ky8mOF47J9+XeBJTQEEtjIgQlZTfXvEd3IqlOQz00V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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