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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3fc5ebb03de60fffab1510480887ca06872571b013fe3560f12e972e4d8b50e' 
  AND token = 'yndDNgWGdy/K9ioPCYX4yQtmRnF76/hzA5LaRZXv0K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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