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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18d35e79e797b39dc5b1ae872e2bb7c7a7618f1f0de31e64ca05fbae909aa91' 
  AND token = 'S/cz46uWBkBtz/+quessaUqtDsZLsE5NW+bOBH9ycQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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