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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26f2e4f2cfa037cf1eafd467736da6366320d52b3078f8af9e60ec6b920816f' 
  AND token = 'YzrWHb5rY8Gv90FmD22MXh4pyUYWA1WBKBMp6oMsX1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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