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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e99cf5a338833745b1027776ff633ff92cc03c8fe5ff6581b979b35f5d6bb12' 
  AND token = '9hdtwcQx85ERW0hxp9GV0YVaqWnLC3huaX55ErA2IQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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