Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953f913c82c7b5db6d19c7ab90c78f6dcaccbb6dd12cf2da79a032469eb69768' 
  AND token = 'votoBjHgcUYuZNG2ThIUM9rS+UQuD2KhkoHOrean6No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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