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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8505238908cb45c97901c6f7cd1103269da0afba608558cb99c9cb1817e7d00f' 
  AND token = 'HM25s9jRxZLr2UDofCsWKTMcul1dzy8oB4HD/U6AX5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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