Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb75e6d4b751ca6c3bbfec911d55242deff239ec0f1681d23ada1b5e91e17ec2' 
  AND token = '1vS43cPY2oJELVwX9yjzV3u32QZXqOFieRMa4PEMHoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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