Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7da5885773b28875e0be9514244e5e7f1e73fc6ef3eb4068b9d28277f7de554' 
  AND token = '6NOqd+nGV5KNSXsDK1KyS7vZxwFZpDyFdBg82y6dxgA=' 
  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"
    }
  }
}