Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469793d9ec4aae0d4a0fcad87f66e43c92624739e95d99df7f285f5ef8054f59' 
  AND token = '1n2VWcg7jetc6A/T1tBguol1vfEESJeXn6dU5Vi30FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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