Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685551b896266c3fce0dea47e8c13f30ab1cf1a215a44d2cfcfc159f800dd017' 
  AND token = '3c2tpuc/heMINxvgj0cOM1CwnzdABQcwGB33yQPS0sk=' 
  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"
    }
  }
}