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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe4d6ea1416bba7247ee0d14a79936187d6f66f01cb33a9c3c0de96ef8e65b42' 
  AND token = 'VW99xXUq+QD4Qdf1Oox/3uYzkRNvorNL1udmWd6c5NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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