Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ff1d9e2ce58821848f744c20bb9b327f659001c4cdcce40c1ed2046b669a76' 
  AND token = '6l/iPn4MNdtMj+mHPbFHS0B0zS0abHShuQ/AYQ4TGv4=' 
  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"
    }
  }
}