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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55dcbf52de7901e9914b3ec81ec4b1094dffd4292aa6429031f35e1303902528' 
  AND token = 'EbAQ+DWWEnr5VDSP+WCB/Zj0PZLDRlhD4JUUe3M3MWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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