Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f302a1973759e34ca026cec372e6ec3208efa576ee4ee3f826d6d34c22c580c' 
  AND token = 'lYyMNWzvFg3tCelDBYca8geP1ZoNZdELMhuxRp/LDjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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