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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aaeb9f7f0bc97d56f4189c53787f7db54b76335b5545c8394e5e8c3f88ddfdc' 
  AND token = 'BtR0DdM+CTwRpWY6Bg2vv2YBMah7zIue3brjPNQyriM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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