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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f197ff0fe4bf655a1b08b4bde99529bb8905bd699369f871fced61ffdfd1980' 
  AND token = 'TVlM56sJKD1DWv79DHU3v/YDDq0Ncr8ejMw8hWV2l1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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