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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4f26bb6c0766247ce40530a19be8eaa7e2ddf1779f7af31af1317592ad85c9' 
  AND token = 'oG/ek3XLbmgEv8X3oVyqF54pTHsXJWuB+pA8p2ANAX8=' 
  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"
    }
  }
}