Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14b272d2e476aadbbe9fc2c4450d47e072b2186f8bb0a04239f6a4121af6147' 
  AND token = 'lZtUzP5Y/g/K2gQ3i21xwBEyaWkCf07bCCX1/PZde/c=' 
  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"
    }
  }
}