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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808a0fcc561ef71058564cb8da98d323033d9362597df16e34f863e51a2be279' 
  AND token = 'bUWB3huEFMYi+U5peak7MKpAQLaMU35V8vn8s+4XoXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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