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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9f72bb7a95b09609b8bc0f613317a871bbd0aea552d371b8d7c15dfc69e423' 
  AND token = 'JGM9GI1b3iIbW9kj6ZUIpF1m3sughyofqf/mw8Nko2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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