SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd08d5c782b0c18240d7b54abd8f897316f2d0a16e2d79a4e894e5d6a1875fe5' 
  AND token = '/CAfA2b0WXyYPc/ifRCVTp+FUn9QZq46JbLGlrX3gUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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