Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a1a9b193c61e3426fe1b9dea34ecc575ac699fcc15ff0697f8ce1123ee7a580' 
  AND token = 'Tt/Wt3IEZcOWoIy1q3mY+t92IKOgh3bcuinjEw+jZtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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