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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cfc26ab9a14c0d9284c99f4bba2833f42bd7b22b03512fdcd9d9eb26cb5d7de' 
  AND token = '2t8wj3ci2JPjQ2bKfoUZUt7L+mH1aQbs8ut+YGkIL+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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