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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3955c6ab6b50e1e40eeb08b5ac433103a287cba27d89cbf7a35c3e513a2769e5' 
  AND token = 'mj0snN3/cVKcvtqjkZmaM9XDFBvqCkGIXn4N4bDaJq4=' 
  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"
    }
  }
}