SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fefd48ff6bac0398cc486cf58acafa7979d044f17ec9177d046d94d254d38fa' 
  AND token = 'a6CwuxRQIQKX/+Np12gX+YmNlPWp0OBNm43UvxsJBWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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