SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f228d46e0b3d7db0edfb72979df714f9e402cf33c439985c46b15a75bf258b' 
  AND token = 'pgwUFw1Go0vugTjDXpQH86KhFk81exRV7Lyrwx7Bk8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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