Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9a055c5bad0e53f2480acddbb82820a90d87b67f2785b37488c3841dadb6f7' 
  AND token = 'BPsr2aUL36xHbvQzw13agm9gb1Ts4hhM5sVwGIK599c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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