Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa63a26670a07c9bd4f318fe96bf9718496b6278d5d515452b5b2343eae86bd0' 
  AND token = 'QZfWIO2r+T3DQy6B5UQ1IPQDggDMfBtxKmEE3lAoKwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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