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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0645828fa9dfe0c9cb08e81ddb15016d905d9f48b5d46a145cb0288d9596c8' 
  AND token = 'k/AiZn6b0XTfhQIcVT2KMUoEciu+QY+DdkcuKu6xc8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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