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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3027c085cbc3a05eec5ec34d7284468f23a1acccbd020c6f60d7781b5163eb22' 
  AND token = '8BAw44RIxyHhry4KjgyL/eelRIQZ6vPRDUdVjYGGuyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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