Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced14ec0b109ff10a50806f5863cc26d3d10b601e68ebca6e4ba2a139c2f1383' 
  AND token = 'YMejFWNFIds7Kjw3dsYoE8SkXIkyBQanRW132Tm1Sak=' 
  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"
    }
  }
}