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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c5b98e629372cc7ebdee3def4ac7ca94e1f7607f59b044bc93b53add75501d' 
  AND token = 'UTc5jcM2447rQu9QtH6oNnep5DLS8CjAgp7yyPRYpQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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