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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8383860ed1b9f72c7ccee282a3b119848b01c58d31fde5477a4fbd4d5626f78' 
  AND token = 'HOuZEq+zrHwCccv09zabNN7oDCquUdhep0J29fgzxQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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