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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af98c3f9a3856bd6f81468aeb70e2b6842a40c7a41ff51ded83b49c0287184e' 
  AND token = 'Qd9oOKrb4R6agxzKyXDouTz4+H8oOTAEMyj6n7nhTpE=' 
  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"
    }
  }
}