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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c33528853c8c021875cdc30c7c7fb138868aa231be783cbd369aa98d20d96d3' 
  AND token = 'Y3JzOzSLRgbvO5zCh9gtMVbM2FkhCjLj5l1VzMu+Y9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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