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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc1bfb9529386149580749d9e5daceb837a54ab1603dbc086291e89be2b7862' 
  AND token = 'SvBg/W6M14YGeONATaVFu1SCGEdC48KLLE1QUI5b7fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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