Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7e235ffdf5a0e61c89285e2462985a595035d2861bda09c801d3622ee565a0' 
  AND token = 'aH/lSoFoPeLQhEx6eIZMYYcoGSDnpGq54juO9uWQqvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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