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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '148dcfec904b35abd91ce67fd57fee8f589a1b7b60b52d9cff469e5ddede00ff' 
  AND token = '4ivhJBxabul5qvYs/SFnIJeqTSaJNcpYIbW8QgQQnVU=' 
  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"
    }
  }
}