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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53c7c8b362d41ac46c9ae32529f3f6fc008617191f7a8a9bca4fdb7316a095c5' 
  AND token = 'ywhYNkY3NgtuLkpjqJEORTW2JpNYRxVB/gaBCcfdi1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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