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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855b49192546d4621a213b1cfc22c46608bf274ec4d3dc6bf8d75806111ca22e' 
  AND token = 'r5PUh/8fgYzZs7H50z59UtbD5tRFbi0FHUfFuiB6u0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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