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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bb0bf4c148a9b5fbb07c58aa589bc576aab69279af26f54de51b7e181a1e3f' 
  AND token = 'pL6nzVkUgMD5NB5WSi8Lb+/lTCWyPnRYoJyKQNZMIB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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