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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aece094e016e8e7841c29033e86c0bcbe38e9b0be1384744bb87109c5d113a60' 
  AND token = 'Qfi9v35LOz9dfJNdWZ8kmCH1GFAiWG6LnD7d6lUtU8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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